Fix missing on layout

package.json

@@ -1,6 +1,6 @@
 {
   "name": "recyclerlistview",
-  "version": "1.4.0-beta.5",
+  "version": "1.4.0-beta.6",
   "description": "The listview that you need and deserve. It was built for performance, uses cell recycling to achieve smooth scrolling.",
   "main": "dist/reactnative/index.js",
   "types": "dist/reactnative/index.d.ts",

src/core/scrollcomponent/BaseScrollComponent.tsx

@@ -14,6 +14,7 @@ export interface ScrollComponentProps {
     scrollThrottle?: number;
     distanceFromWindow?: number;
     useWindowScroll?: boolean;
+    onLayout?: any;
 }
 export default abstract class BaseScrollComponent extends React.Component<ScrollComponentProps, {}> {
     public abstract scrollTo(x: number, y: number, animate: boolean): void;

src/platform/reactnative/scrollcomponent/ScrollComponent.tsx

@@ -26,7 +26,6 @@ export default class ScrollComponent extends BaseScrollComponent {
     private _height: number;
     private _width: number;
     private _isSizeChangedCalledOnce: boolean;
-    private _dummyOnLayout: (event: LayoutChangeEvent) => void = TSCast.cast(null);
     private _scrollViewRef: ScrollView | null = null;
 
     constructor(args: ScrollComponentProps) {
@@ -42,7 +41,7 @@ export default class ScrollComponent extends BaseScrollComponent {
 
     public scrollTo(x: number, y: number, isAnimated: boolean): void {
         if (this._scrollViewRef) {
-            this._scrollViewRef.scrollTo({x, y, animated: isAnimated});
+            this._scrollViewRef.scrollTo({ x, y, animated: isAnimated });
         }
     }
 
@@ -63,13 +62,13 @@ export default class ScrollComponent extends BaseScrollComponent {
         // } = this.props;
         return (
             <Scroller ref={(scrollView: any) => this._scrollViewRef = scrollView as (ScrollView | null)}
-                      removeClippedSubviews={false}
-                      scrollEventThrottle={this.props.scrollThrottle}
-                      {...this.props}
-                      horizontal={this.props.isHorizontal}
-                      onScroll={this._onScroll}
-                      onLayout={(!this._isSizeChangedCalledOnce || this.props.canChangeSize) ? this._onLayout : this._dummyOnLayout}>
-                <View style={{flexDirection: this.props.isHorizontal ? "row" : "column"}}>
+                removeClippedSubviews={false}
+                scrollEventThrottle={this.props.scrollThrottle}
+                {...this.props}
+                horizontal={this.props.isHorizontal}
+                onScroll={this._onScroll}
+                onLayout={(!this._isSizeChangedCalledOnce || this.props.canChangeSize) ? this._onLayout : this.props.onLayout}>
+                <View style={{ flexDirection: this.props.isHorizontal ? "row" : "column" }}>
                     <View style={{
                         height: this.props.contentHeight,
                         width: this.props.contentWidth,
@@ -97,5 +96,8 @@ export default class ScrollComponent extends BaseScrollComponent {
                 this.props.onSizeChanged(event.nativeEvent.layout);
             }
         }
+        if (this.props.onLayout) {
+            this.props.onLayout(event);
+        }
     }
 }